Fatigue Behavior of the FGH96 Superalloy under High-Temperature Cyclic Loading

Strain-controlled low-cycle fatigue (LCF) tests and stress-controlled creep-fatigue interaction (CFI) tests on the FGH96 superalloy were carried out at 550 & DEG;C to obtain the cyclic softening/hardening characteristics at different strain amplitudes and ratcheting strain characteristics under different hold time. The failure mechanism of the FGH96 superalloy under different loading conditions was analyzed through fracture observations. The results show that the FGH96 superalloy exhibits different cyclic softening/hardening characteristics at different strain amplitudes, and the introduction of the hold time at peak stress exacerbates the ratcheting strain of the FGH96 superalloy under asymmetric stress cycles. Fracture observations show that the magnitude of the strain amplitude, high-temperature oxidation, and the introduction of the hold time will affect the mechanical properties of the FGH96 superalloy and change its fracture mode.

Automated summary

Strain-controlled low-cycle fatigue (LCF) tests and stress-controlled creep-fatigue interaction (CFI) tests were conducted on the FGH96 superalloy at 550°C to investigate its cyclic softening/hardening characteristics at different strain amplitudes and ratcheting strain characteristics under different hold time. The failure mechanism of the FGH96 superalloy under different loading conditions was analyzed through fracture observations. The results showed that the FGH96 superalloy exhibited different cyclic softening/hardening characteristics at different strain amplitudes, and the introduction of hold time exacerbated its ratcheting strain under asymmetric stress cycles. Fracture observations indicated that the strain amplitude, high-temperature oxidation, and the introduction of hold time affected the mechanical properties and fracture mode of the FGH96 superalloy.